@article{PMF_1916_27_1_a10,
     author = {Mazurkiewicz, Stefan},
     title = {O zwi\k{a}zku mi\k{e}dzy istnieniem granicy $lim_{\ensuremath{\Delta}x=0} ((\ensuremath{\Delta}^n f(x))/(\ensuremath{\Delta}x^n))_{x=x_0}$ a ci\k{a}g{\l}o\'sci\k{a} funkcyi f(x)},
     journal = {Prace Matematyczno-Fizyczne},
     pages = {195--201},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1916},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/PMF_1916_27_1_a10/}
}